The Temperature-Humidity Index $I$ (Or Humidex, for Short) Is the Perceived Air Temperature When

question 112

Short Answer

The temperature-humidity index $I$ (or humidex, for short) is the perceived air temperature when the actual temperature is $T$ and the relative humidity is $h$ , so we can write $I = f ( T , h )$ . The following table of values of $I$ is an excerpt from a table compiled by the National Oceanic and Atmospheric Administration. For what value of $T$ is $f ( T , 50 ) = 107$ ?
$\begin{array}{|c|c|c|c|c|c|c|c|}\hline \begin{array}{l}T \\\downarrow\end{array} & \rightarrow & 20 & 30 & 40 & 50 & 60 & 70 \\\hline 80 & 74 & 76 & 78 & 82 & 83 & 86 \\\hline 85 & 81 & 82 & 84 & 86 & 90 & 94 \\\hline 90 & 86 & 90 & 93 & 96 & 101 & 106 \\\hline 95 & 94 & 94 & 98 & 107 & 111 & 125 \\\hline 100 & 99 & 101 & 109 & 122 & 129 & 138 \\\hline\end{array}$

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